1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU Lesser General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU Lesser
19** General Public License version 3 as published by the Free Software
20** Foundation and appearing in the file LICENSE.LGPL3 included in the
21** packaging of this file. Please review the following information to
22** ensure the GNU Lesser General Public License version 3 requirements
23** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24**
25** GNU General Public License Usage
26** Alternatively, this file may be used under the terms of the GNU
27** General Public License version 2.0 or (at your option) the GNU General
28** Public license version 3 or any later version approved by the KDE Free
29** Qt Foundation. The licenses are as published by the Free Software
30** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31** included in the packaging of this file. Please review the following
32** information to ensure the GNU General Public License requirements will
33** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34** https://www.gnu.org/licenses/gpl-3.0.html.
35**
36** $QT_END_LICENSE$
37**
38****************************************************************************/
39
40#include <QtCore/qstring.h>
41#include <QtCore/qdebug.h>
42#include <QtCore/QDir>
43#include <QtCore/QDebug>
44
45#include "camerabinserviceplugin.h"
46
47#include "camerabinservice.h"
48#include <private/qgstutils_p.h>
49
50QT_BEGIN_NAMESPACE
51
52template <typename T, int N> static int lengthOf(const T(&)[N]) { return N; }
53
54CameraBinServicePlugin::CameraBinServicePlugin()
55 : m_sourceFactory(0)
56{
57}
58
59CameraBinServicePlugin::~CameraBinServicePlugin()
60{
61 if (m_sourceFactory)
62 gst_object_unref(GST_OBJECT(m_sourceFactory));
63}
64
65QMediaService* CameraBinServicePlugin::create(const QString &key)
66{
67 QGstUtils::initializeGst();
68
69 if (key == QLatin1String(Q_MEDIASERVICE_CAMERA)) {
70 if (!CameraBinService::isCameraBinAvailable()) {
71 guint major, minor, micro, nano;
72 gst_version(major: &major, minor: &minor, micro: &micro, nano: &nano);
73 qWarning(msg: "Error: cannot create camera service, the 'camerabin' plugin is missing for "
74 "GStreamer %u.%u."
75 "\nPlease install the 'bad' GStreamer plugin package.",
76 major, minor);
77 return nullptr;
78 }
79
80 return new CameraBinService(sourceFactory());
81 }
82
83 qWarning() << "Gstreamer camerabin service plugin: unsupported key:" << key;
84 return 0;
85}
86
87void CameraBinServicePlugin::release(QMediaService *service)
88{
89 delete service;
90}
91
92QMediaServiceProviderHint::Features CameraBinServicePlugin::supportedFeatures(
93 const QByteArray &service) const
94{
95 if (service == Q_MEDIASERVICE_CAMERA)
96 return QMediaServiceProviderHint::VideoSurface;
97
98 return QMediaServiceProviderHint::Features();
99}
100
101QByteArray CameraBinServicePlugin::defaultDevice(const QByteArray &service) const
102{
103 return service == Q_MEDIASERVICE_CAMERA
104 ? QGstUtils::enumerateCameras(factory: sourceFactory()).value(i: 0).name.toUtf8()
105 : QByteArray();
106}
107
108QList<QByteArray> CameraBinServicePlugin::devices(const QByteArray &service) const
109{
110
111 return service == Q_MEDIASERVICE_CAMERA
112 ? QGstUtils::cameraDevices(factory: m_sourceFactory)
113 : QList<QByteArray>();
114}
115
116QString CameraBinServicePlugin::deviceDescription(const QByteArray &service, const QByteArray &deviceName)
117{
118 return service == Q_MEDIASERVICE_CAMERA
119 ? QGstUtils::cameraDescription(device: deviceName, factory: m_sourceFactory)
120 : QString();
121}
122
123QVariant CameraBinServicePlugin::deviceProperty(const QByteArray &service, const QByteArray &device, const QByteArray &property)
124{
125 Q_UNUSED(service);
126 Q_UNUSED(device);
127 Q_UNUSED(property);
128 return QVariant();
129}
130
131QCamera::Position CameraBinServicePlugin::cameraPosition(const QByteArray &deviceName) const
132{
133 return QGstUtils::cameraPosition(device: deviceName, factory: m_sourceFactory);
134}
135
136int CameraBinServicePlugin::cameraOrientation(const QByteArray &deviceName) const
137{
138 return QGstUtils::cameraOrientation(device: deviceName, factory: m_sourceFactory);
139}
140
141GstElementFactory *CameraBinServicePlugin::sourceFactory() const
142{
143 if (!m_sourceFactory) {
144 GstElementFactory *factory = 0;
145 const QByteArray envCandidate = qgetenv(varName: "QT_GSTREAMER_CAMERABIN_SRC");
146 if (!envCandidate.isEmpty())
147 factory = gst_element_factory_find(name: envCandidate.constData());
148
149 static const char *candidates[] = { "subdevsrc", "wrappercamerabinsrc" };
150 for (int i = 0; !factory && i < lengthOf(candidates); ++i)
151 factory = gst_element_factory_find(name: candidates[i]);
152
153 if (factory) {
154 m_sourceFactory = GST_ELEMENT_FACTORY(gst_plugin_feature_load(
155 GST_PLUGIN_FEATURE(factory)));
156 gst_object_unref(object: (GST_OBJECT(factory)));
157 }
158 }
159
160 return m_sourceFactory;
161}
162
163QT_END_NAMESPACE
164

source code of qtmultimedia/src/plugins/gstreamer/camerabin/camerabinserviceplugin.cpp